Help Replacing Shower Diverter Valve
I live in an old house that appears to have 70s era shower valve set with a push-pin diverter. Recently, the diverter started only diverting about 25% of the water to the shower when pushed. The pin moves smoothly and there no leaks, so I concluded the problem existed inside the diverter valve.
When I removed the supply valve knob and the fixture plate, I saw that with the size of the hole in the tile I would have difficulty getting a wrench in to unscrew the diverter valve.
This is the opening showing the entire valve assembly (single supply valve is on top and the diverter pin is underneath):
This a close-up of the diverter valve as screwed into the supply line:
I tried a basin wrench, but the one I have is too big to turn in the space allowed. Are there different sizes of basin wrenches, or another tool that could use to get in to unscrew the diverter?